Math stuff: 11x11= 121 and 1111x1111 = 1234321 and 111111x111111 = 12345654321

[Bucky]

See the pattern?

1,111,111 x 1,111,111 = 1,234,567,654,321

11,111,111 x 11,111,111 = 123,456,787,654,321

111,111,111 x 111,111,111 = 12,345,678,987,654,321

so what happens next? My Excel program says that...

1,111,111,111 x 1,111,111,111 = 1,234,567,900,987,650,000

But that doesn't look right to me.

[Dr. Strange]

1. Damn that base ten!

[pokerfan]

2. Reminds me of my favorite on-line puzzle

http://www.digicc.com/fido

[rug]

3. Why are there 13 in a baker's dozen?

[Bucky]

4. "and one to grow on" - Just another way to create customer goodwill

Sadly, when I go to the donut shop, they only give me 12.

[foo_bar]

5. I guess it stops being cool after 9 digits in base 10

in base 11: 1,111,111,111 x 1,111,111,111 = 123456789A987654321

[Strong Atheist]

6. Rounding, since it would HAVE to end in a "1". nt.

[foo_bar]

7. that too.

Imprecision to be precise:

We sometimes get mails from our customers claiming to have found a calculation error in Excel, when in fact the calculation isn't wrong, but the side effects of binary floating point precision make it seem that way. <...>

The resulting value in A3 is 1.2E+100, the same value as A1. This is because Excel stores 15 digits of precision. At least 100 digits of precision would be required to calculate the formula above.

http://blogs.msdn.com/excel/archive/2008/04/10/understanding-floating-point-precision-aka-why-does-excel-give-me-seemingly-wrong-answers.aspx

So Microsoft says it isn't the wrong answer, you just need to lower your expectations.

[Strong Atheist]

8. "it isn't the wrong answer, it just isn't right." - That's just

wrong...


:rofl: